Valve.



PATENTED NOV. 20, 1906.

S. SGHUESSLER.

VALVE.

APPLICATION FILED Jxmnze, 1905.

Attorneys STEPHEN SCHUESSLER, OF ATLANTA, GEORGIA.

VALVE. I

Specification of Letters Patent.

Patented Nov. 20, 1906.

Application filed June 29.1905. Serial No. 26 7,642.

has for its principal object to provide a choker-valve that will automatically close or partly close after the pressure in the presscylinder and the source of supply or pump have equalized and will thereafter permit the passage of a comparatively small quantity of fluid to force the plunger of the press to the limit of its stroke A further object of the invention is to provide a choker-valve that will automatically open when the pressure on the supply or pump side is reduced below that in the press cylinder in order to permit the return of the lunger.

With these and other objects in view, as will more fully hereinafter appear, the inven tion consists in certain novel features of construction and arrangement of parts hereinafter fully described, illustrated in the acconr.

panying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size, and minor details of the structure may be made without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings, Figure 1 is a sectional elevation of a high-pressure valve constructed in accordance with the invention, showing the valve in its open position. Fig. 2 is a similar view with the parts in closed position. Fig. 3 is a detail perspective view of the valve member detached.

Similar numerals of reference are employed to indicate corresponding parts throughout the several figures of the drawings.

The valve-casing 10 has a central cylindrical bore 1 1, closed at thebottom by a threaded plug 12, a central packing-ring 13 being placed at the end of the plug to prevent leakage. From one side of the cylinder leads an inlet-port 14, connected to the accumulator, pump, or other source of supply, and immediately above this inlet-port the cylindrical bore terminates in an inclined valve-seat 15,

from the central portion of which leads a passage 16, which may communicate with the cylinder of the press.

Arranged within the cylindrical bore 11 is a cylindrical valve-carrying piston 17 having a stem 18, which projects through an opening formed in a threaded plug 19, the stem passing also through a suitable packing 20, that is held in place by the plug. The upper end of the stem carries a small ball or roller 22, on which rests a lever 23, the rear end of which is pivoted to a bracket 24, rojecting from the valve-casing. At the f fee end of the lever is an adjustable weight 25, that tends to force the valve down to the open position shown in Fig. 1 and permit free communication between the two ports 14 and 16.

The seating-face of the choker-valve 27, carried by the piston, is tapered to correspond to the inclination of the valve-seat, and below this tapered portion is formed an annular recess 28, which when the valve is closed is in communication with the inletport 14, as will be seen on reference to Fig. 2. The seating-face of the valve is provided with a small feed-groove 29, which when the valve is closed permits the flow of a comparatively small quantity of fluid from the inlet to the outlet port, and said valve is further provided with a groove 30, that extends for the full length of said valve and places the upper portion of the valve-casing in communication with the lower portion of the cylindrical bore 11 at a point below the valve.

The valve being in the open position shown in Fig. 1, oil, water, or other fluid forced in through the port 14 will pass through the port 16 toward the hydrostatic press until the pressure in the cylinder of the latter is about equal to the pressure in the accumulator. The liquid will then be forced down through the port 30 to a point below the piston 17, and as the area of the bottom of this piston is greater than the pressure area at the top of the choker-valve 27 the valve will move to closed position, as shown in Fig. 2, leaving the port or passage 29 open and permitting the passage of the small uantity of fluid necessary to gradually force t e plunger of the press to the limit of its stroke. When the plunger has been held up for a suflicient length of time, the pressure at the port 14 is reduced, and the liquid flows from below the valve upward through the passage 30, and this, added to the pressure at the port 16,

tends to move the valve down to open position until the valve is fully open, and the liquid is allowed to flow from the cylinder of the press. The downward movement of the valve is assisted materially by the weighted lever 23, and thus renders the operation cer tain and positive.

While the valve is intended principally for controlling the flow of fluid under heavy pressure, it may be employed in various other connections where it is desired to automatically cut ofi the flow after a certain pressure has been reached. a

That portion. of the valve exposed to wear .is preferably made detachable, as will be seen on reference to Fig. 1, in order to permit ready renewal.

Having thus described the invention, what is claimed is 1. A valve for controlling the flow of a fluid under pressure from a source of-supply to a press or the like, said valve including a casing having a cylindrical bore, and a valveseat, and provided with a liquid-passage, a piston arranged within the cylindrical bore and having one face exposed to the pressure of fluid from the inlet or supply side, and a choker-valve carried by the piston and arranged to close against the seat, the valve being of less area than the piston and being exposed when in closed position to the pressure from the press side.

2. The combination with a casing having a liquid-passage terminating in inlet and outlet ports, a choker-valve arranged in said passage, a piston carrying the valve, said valve and piston having pressure areas of different extent, the smaller area of the valve when in closed position being exposed to the pressure from the outlet or discharge side, and the larger area of the piston being exposed to pressure from the inlet or supply side, there being a port or passage to permit the flow of a small quantity of liquid through the casing when the valve is closed.

3. The combination with a valve-casing having a liquid-passage terminating in inlet and outlet ports, a choker-valve for closing the passage, the face of the valve when in open position being exposed to the full pressure of fluid in the passage, and when in closed position being exposed to the pressure from the outlet or discharge side, a piston carrying said valve, and presenting a larger pressure area than the latter, the pressure area of the piston being constantly exposed to pressure from the inlet. side, there being a port or passage for permitting the flow of a small quantity of liquid through the valvecasing when the choker-valve is closed.

4. In a valve, a casing having a cylindrical bore, and a liquid-passage terminating in inlet and outlet ports, a valve-seat at the end of the cylindrical bore, a piston .mounted' within the bore, a choker-valve carried by the piston and arranged to close against the valve-seat, said valve having an annular recess near its seat end, the recess being in constant communication with the inlet-port, a feed-groove for permitting the passage of fluid from the inlet to the outlet port when the valve is closed, and an auxiliary passage 'for permitting the flow of fluid to a point between the piston and the end of the bore.

5. The combination with a valve-casing having a cylindrical b ore and provided with a pressure area, a weighted lever engaging the stem and tending to hold the valve in open position, and a feed-groove for permitting the passage of fluid from the inlet to the outlet port after the valve is closed. 4

In testimony that I claimthe foregoing as my own I have hereto aflixed my signature in the presence of two witnesses.

STEPHEN SOHUESSLER.

Witnesses:

T. C. MILLER, W. W. CLARKE. 

